part of part_of part of contains process contains process develops_from develops from develops from hemopoiesis endocrine system kidney pronephros hematopoietic system compound organ mesoderm-derived structure hemopoietic organ abdomen element head kidney kidney marrow MESH:D060226 in GO, head kidney isa pronephros. Modified the ZFA relationships - the HK is derived from the anterior part of the pronephros and persists until adulthood BTO:0005189 Teleost head kidney consists of fused bilateral lobes located in the anterior part of the kidney. It is analogous to the mammalian bone marrow and the primary site of definitive hematopoiesis[ZFA,modified]. anterior kidney ZFA:0000669 The zebrafish head kidney consists of fused bilateral lobes located in the anterior part of the kidney. It is analogous to the mammalian bone marrow and the primary site of definitive hematopoiesis. Davidson and Zon 2004.[TAO] TAO:0000669 UBERON:0007132